Be a ninja! by _enderslayer174_

Adds Ninja weapons/armor to your world! To make the armor, just throw down a piece of leather armor with a potion of invisibility and pick up the armor that spawns. To make the ninja tools, throw down gunpowder and a coal block for Impact Smoke or throw down a quartz "shard" with an iron ingot to make a Shuriken. Impact Smoke gives blindness to nearby entities when thrown down, and the shuriken is self-explanatory.